Sec Form 3 Filing - Mhatre Ravi @ Rubrik, Inc. - 2024-04-24

FORM 3 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Mhatre Ravi 2. Issuer Name and Ticker or Trading Symbol Rubrik, Inc. [ RBRK] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 2200 SAND HILL ROAD 3. Date of Earliest Transaction (MM/DD/YY) 04/24/2024 (Street) MENLO PARK, CA94025 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Series A Preferred Stock ( 1 ) ( 1 ) ( 1 ) Class B Common Stock 14,132,696 I By Lightspeed Venture Partners IX, L.P. ( 2 ) Series B Preferred Stock ( 1 ) ( 1 ) ( 1 ) Class B Common Stock 3,329,928 I By Lightspeed Venture Partners IX, L.P. ( 2 ) Series C Preferred Stock ( 1 ) ( 1 ) ( 1 ) Class B Common Stock 2,940,030 I By Lightspeed Venture Partners Select II, L.P. ( 3 ) Series D Preferred Stock ( 1 ) ( 1 ) ( 1 ) Class B Common Stock 8,015,457 I By Lightspeed SPV I, LLC ( 4 ) Series D Preferred Stock ( 1 ) ( 1 ) ( 1 ) Class B Common Stock 843,732 I By Lightspeed Venture Partners Select II, L.P. ( 3 ) Series E Preferred Stock ( 1 ) ( 1 ) ( 1 ) Class B Common Stock 5,094,719 I By Lightspeed SPV I-B, LLC ( 5 ) Series E Preferred Stock ( 1 ) ( 1 ) ( 1 ) Class B Common Stock 3,566,303 I By Lightspeed SPV I-C, LLC ( 6 ) Series E Preferred Stock ( 1 ) ( 1 ) ( 1 ) Class B Common Stock 297,192 I By Lightspeed Venture Partners IX, L.P. ( 2 ) Series E Preferred Stock ( 1 ) ( 1 ) ( 1 ) Class B Common Stock 339,648 I By Lightspeed Venture Partners Select II, L.P. ( 3 ) Class B Common Stock ( 7 ) ( 7 ) ( 7 ) Class A Common Stock 406,637 I By Lightspeed Venture Partners X, L.P. ( 8 ) Class B Common Stock ( 7 ) ( 7 ) ( 7 ) Class A Common Stock 18,084 I By Lightspeed Affiliates X, L.P ( 9 )

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Mhatre Ravi 2200 SAND HILL ROAD MENLO PARK, CA94025 X X Signatures /s/ Anne-Kathrin Lalendran, Attorney-in-Fact 04/24/2024 Signature of Reporting Person Date

Explanation of Responses:

( 1 )The Series A Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock each is convertib le on a one-for-one basis into Class B Common Stock at any time at the holder's election and will convert automatically upon the closing of the Issuer's initial public offering and has no expiration date. ( 2 )Shares are held by Lightspeed Venture Partners IX, L.P. ("Lightspeed IX"). Lightspeed General Partner IX, L.P. ("LGP IX") is the general partner of Lightspeed IX. Lightspeed Ultimate General Partner IX, Ltd. ("LUGP IX") is the general partner of LGP IX. The Reporting Person is a director of LUGP IX and shares voting and dispositive power with respect to the shares held by Lightspeed IX. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein. ( 3 )Shares are held by Lightspeed Venture Partners Select II, L.P. ("Lightspeed Select II"). Lightspeed General Partner Select II, L.P. ("LGP Select II") is the general partner of Lightspeed Select II. Lightspeed Ultimate General Partner Select II, Ltd. ("LUGP Select II") is the general partner of LGP Select II. The Reporting Person is a director of LUGP Select II and shares voting and dispositive power with respect to the shares held by Lightspeed Select II. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein. ( 4 )Shares are held by Lightspeed SPV I, LLC ("Lightspeed SPV I"). LS SPV Management, LLC ("LS SPV") is the manager of Lightspeed SPV I. The Reporting Person is a managing member of LS SPV and shares voting and dispositive power with respect to the shares held by Lightspeed SPV I. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein. ( 5 )Shares are held by Lightspeed SPV I-B, LLC ("Lightspeed SPV I-B"). LS SPV is the manager of Lightspeed SPV I-B. The Reporting Person is a managing member of LS SPV and shares voting and dispositive power with respect to the shares held by Lightspeed SPV I-B. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein. ( 6 )Shares are held by Lightspeed SPV I-C, LLC ("Lightspeed SPV I-C"). LS SPV is the manager of Lightspeed SPV I-C. The Reporting Person is a managing member of LS SPV and shares voting and dispositive power with respect to the shares held by Lightspeed SPV I-C. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein. ( 7 )Each share of Class B Common Stock held by the Reporting Person will automatically convert into one share of Class A Common Stock upon the sale or transfer of such share of Class B Common Stock, subject to certain exceptions, and in certain other circumstances described in the Issuer's amended and restated certificate of incorporation. Each share of Class B Common Stock will also be convertible at any time at the option of the Reporting Person into one share of Class A Common Stock. ( 8 )Shares are held by Lightspeed Venture Partners X, L.P. ("Lightspeed X"). Lightspeed General Partner X, L.P. ("LGP X") is the general partner of Lightspeed X. Lightspeed Ultimate General Partner X, Ltd. ("LUGP X") is the general partner of LGP X. The Reporting Person is a director of LUGP X and shares voting and dispositive power with respect to the shares held by Lightspeed X. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein. ( 9 )Shares are held by Lightspeed Affiliates X, L.P. ("Lightspeed Affiliates X"). LGP X is the general partner of Lightspeed Affiliates X. LUGP X is the general partner of LGP X. The Reporting Person is a director of LUGP X and shares voting and dispositive power with respect to the shares held by Lightspeed Affiliates X. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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